Foam fractionation is an adsorption bubble separation technique allowing recovery and immediate reuse of surfactants. This work was aimed at investigating the variations in recovery efficiency and physicochemical property of sodium dodecyl benzene sulfonate (SDBS) through multiple foam fractionation operation. First, a suitable SDBS concentration of 0.05 g/L was determined for preparing feeding solution. Subsequently, effects of volumetric air flow rate, height ratio of liquid phase and foam phase, and pore diameter of gas distributor on recovery efficiency of SDBS were investigated, respectively. Response surface methodology (RSM) was used to optimize the operating conditions of foam fractionation for separating SDBS. Under the conditions of volumetric air flow rate 80 mL/min, height ratio of liquid phase and foam phase 1:2, and pore diameter of gas distributor 0.180 mm, enrichment ratio and recovery percentage of SDBS were 134.83 ± 6.74 and 63.43 ± 3.17%, respectively. In repetitive separation experiments, the maximum separation number of recovered SDBS by foam fractionation was 3. Experimental results of surface activity and foam properties of recovered SDBS solution suggested that the interfacial adsorption and desorption processes had induced the structural transition and irreversible aggregation of SDBS molecules after multiple foam fractionation operation.

泡沫分离是一种吸附气泡分离技术，可回收和立即重新使用表面活性剂。这项工作旨在研究十二烷基苯磺酸钠（SDBS）通过多次泡沫分离操作的回收效率和理化性质的变化。首先，确定合适的0.05 g / L SDBS浓度以制备进料溶液。随后，分别研究了空气体积流量，液相和泡沫相的高度比以及气体分配器的孔径对SDBS回收效率的影响。响应面方法（RSM）用于优化分离SDBS的泡沫分离的操作条件。在空气体积流量为80 mL / min，液相与泡沫相高度比为1：2的条件下，气体分布器的孔径为0.180mm，SDBS的富集率和回收率分别为134.83±6.74和63.43±3.17％。在重复分离实验中，通过泡沫分级分离回收的SDBS的最大分离数为3。回收的SDBS溶液的表面活性和泡沫性质的实验结果表明，界面吸附和解吸过程诱导了SDBS分子的结构转变和不可逆聚集。多次泡沫分馏操作。